Two Books on a Bookshelf

Whenever you compare two or more objects, there is so much more there than meets the eye.

Imagine a bookshelf with just two books on it.

1) Make a list of all the ways that the two books could be similar (e.g., "both are written by authors from the same country," "both covers are a similar color," etc.). How long can you make your list? Can you make your list become infinitely long?

2) One book is to the left of the other on the shelf. Make a list of all the reasons that the two books are in the order that they are in (e.g., "they are in alphabetical order by the author's last name," "they are in order by the number of pages in the books," etc.). How long can you make your list? Can you make your list become infinitely long?